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I just installed Mathematica 9 on Windows 8 64-bit. When I run it and try to execute commands, the first command works perfectly, but the second and further commands don't work. There is no completion even when evaluating expression as simple as 1!

When I work directly in the kernel, everything works correctly

Why is it so? How do I correct it?

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What is the first input that you entered, and what is the second input that you tried but did not work? – Arnoud Buzing Feb 22 at 22:23
You might want to try temporarily turning off any anti-virus programs that you have running. These programs sometimes interfere with the communication between the Front End and kernel. If that fixes the problem, you might want to try whitelisting Mathematica in your antivirus program. – KAI Feb 22 at 22:48
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Does this happen if you run math or MathKernel too? Or just when running the Mathematica notebook program? – Joel Klein Feb 22 at 23:13
Did you ever have a previous version of Mathematica installed on that machine? You can do a full reset by removing the directory %appdata%\Mathematica. Warning: if you do this, you'll need to activate it again. – Szabolcs Feb 23 at 4:17
@Arnoud Buzing I input differnt commands, the last was 101! and 1! – skeeph Feb 23 at 7:21
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